Please provide me required CSS to perform those operations. If these is any other method to do this, please also tell me in little detail. I tried firebug and succeed in doing almost all required work but these 6 tweaks are still left.

Last question, How can I edit header.php... I mean I have read that changing parent theme is no use as update will remove all customizations.
I have only style.css
Do I have to copy header.php and after that will have to edit it?